CN102714866A - A method and transmitter node for transmitting DM-RS pattern - Google Patents

Abstract

The present invention relates to a transmitter node for transmitting a demodulation reference signal pattern in a resource block to a receiver node (12) using more than two transmission layers over a plurality of transmission antennas in a radio communications network. The transmitter node (10) comprises a mapping circuit (1301) configured to map a plurality of codewords to the more than two transmission layers. Furthermore, the transmitter comprises an additional mapping circuit (1302) configured to map each of the more than two transmission layers to a respective demodulation reference signal port according to a fixed pattern based on a transmission rank. Each of the demodulation reference signal ports is arranged to add a demodulation reference signal pattern to the resource block and the demodulation reference signal ports are associated to two code division multiplexing groups according to an association pattern. The transmission layers of each of the two code division multiplexing groups are code division multiplexed and the transmission layers of different code division multiplexing groups are frequency division multiplexed. In addition, the transmitter node (10) comprises a precoding circuit (1303) configured to precode each codeword and demodulation reference signal pattern, carried over respective transmission layer, and a transmitting circuit (1304) comprising the plurality of transmission antennas and configured to transmit the precoded demodulation reference signal pattern in the resource block to the receiver node (12).

Description

Be used to transmit the method and the conveyer node of DM-RS pattern

Technical field

The present invention relates to conveyer node and method wherein in the radio circuit.Specifically, the present invention relates in radio circuit, transmit demodulated reference signal mode.

Background technology

The 3rd generation partner program (3GPP) is responsible for the standardization of universal mobile telecommunications service (umts) system and Long Term Evolution (LTE).LTE is the packet-based technology of communicating by letter of high speed that is used for realizing in down link and up link, all reaching High Data Rate, and it is regarded as the next generation mobile communication system of UMTS system.The Access Network of LTE is also referred to as evolved universal ground Access Network (E-UTRAN).The first version of LTE is called the 8th version (Rel-8), and the peak rate of 300 Mbps can be provided, and for example 5 ms or radio net still less postpone, the network architecture that the enlarging markedly and be designed to of spectrum efficiency simplify network operation, reduce cost etc.For supporting High Data Rate, LTE allows the system bandwidth up to 20 MHz.LTE also can operate in different frequency bands, and can operate in FDD (FDD) pattern and time division duplex (TDD) pattern at least.Modulation technique of in LTE, using or transfer scheme are called OFDM (OFDM).

For next generation mobile communication system, for example, international mobile telecommunication (IMT) is senior and/or LTE is senior (it is the evolution of LTE), is discussing the support up to the bandwidth of 100 MHz.Senior can being regarded as of LTE is the version in future of LTE standard, and because it is the evolution of LTE, and therefore, backwards compatibility is important, makes that LTE is senior can be deployed in the spectrum that LTE taken.In LTE that is called evolution NodeB (eNB) and LTE advanced wireless electricity base station, can adopt a plurality of antennas that have precoding/beam shaping (beamforming) technology so that High Data Rate is provided to subscriber equipment.Therefore, LTE and LTE are senior is the example that the radio system of multiple-input and multiple-output (MIMO) technology can be provided.Another example based on the system of MIMO is World Interoperability for Microwave Access, WiMax (WiMAX) system.

Reference signal (RS) is also referred to as predefine training sequence/signal, and it is extensive use in wireless communication system, is intended to improve the detection performance.Use the basic communication system of reference signal can comprise conveyer node and receiver node.The conveyer node can be represented by radio base station or subscriber equipment, and receiver node can be represented by subscriber equipment or radio base station.The conveyer node can comprise the data block maker, and wherein, RS is inserted in the transmission block.The data block that comprises RS is sent to receiver node through wireless channel subsequently.In addition, predefine RS between conveyer node and receiver node.Therefore, at receiver node, earlier through in channel estimator, using the RS target to use channel estimating.This channel estimator make the conveyer node to carry out coherent detection in case in channel demodulator demodulated received signal, with reliable and suitable mode restore data.With regard to down link, the conveyer node can transmit signal through a plurality of transmission antennas, and receiver node can receive signal through a plurality of reception antennas.The channel matrix of expression channel status can be confirmed by the quantity that transmits antenna and reception antenna.Line number equals the quantity of reception antenna, and columns equals to transmit the quantity of antenna.The transmission order of matrix is to pass through the maximum quantity of different types of information of wireless channel transmission.That uses that every kind of information of different types of information that a plurality of transmission antennas transmit may be defined as that stream or following uses equally is defined as transport layer.

In LTE Rel-10, for reaching LTE advanced downlink spectrum efficiency 30bps/Hz, should use certain senior antenna configurations, for example, 8 * 8 high-order mimos are supported to transmit up to 8 transport layers.Transmit and when receiving data through a plurality of transmission and reception antenna, should know that channel status between antenna is suitably to receive signal.Correspondingly, should in Rel-10, define the channel condition information (CSI) that is used for up to the data of 8 transport layers are recovered measures and channel demodulation.In LTE Rel-8; Cell specific reference signal (CRS) be used for down link transfer mode 1/2/3/4/5/6 channel measurement and channel demodulation the two, and special-purpose RS (DRS) or the specific RS of UE are used for the channel demodulation of down link transfer mode 7 (being single transport layer beam shaping).If CRS is used for carrying out the channel measurement and the demodulation of high-order mimo, then overhead will increase inevitably, and therefore, throughput performance will seriously descend.Therefore, considered two types downlink reference signal for LTE Rel-10:

Channel state information reference signals (CSI-RS) makes CSI estimate to be used for the for example purpose of CQI (CQI)/precoding matrix indicators (PMI)/transmission order designator (RI) report when needed.This down link RS is:

-sub-district is specific

-be sparse in frequency with in the time

-in the data area middle punch (puncture) of common/multicast/broadcast Single Frequency Network (MBSFN) subframe.

Demodulated reference signal (DM-RS) is used for the purpose of physical down link sharing channel (PDSCH) demodulation.This downlink reference signal is

-UE is specific, that is, the PDSCH that expection is used for particular UE will carry out identical pre-encode operation with DM-RS

-only in transport layer that eNodeB dispatches for transmission and Resource Block, exist

-the signal that on different transport layers, transmits is mutually orthogonal at eNodeB

-will introduce 8 DM-RS ports altogether

In this article, embodiment only concentrates in the design of DM-RS.

Fig. 1The DM-RS Design Pattern that is used for general cyclic prefix (CP) is shown.In LTE, radio frame structure comprises the subframe of 10 1 ms.One sub-frame comprises the time slot of two 0.5 ms.Time slot comprises a plurality of OFDMs (OFDM) symbol and a plurality of Resource Block RB in the frequency domain in the time-domain.A Resource Block is shown in Fig. 1, and is defined in along in the symbol of x axle and along in the frequency of y axle.Resource Block is included in 12 carrier waves that send during the delivery time interval (TTI), and a delivery time is the time of transmitting a sub-frame at interval.Each time slot comprises seven symbols.Resource Block comprises a plurality of Resource Units.Resource Unit (RE) is the minimum unit in the OFDM, and is an OFDM symbol that on a carrier wave, transmits.Example illustrates the transmission order 1-4 DM-RS pattern that is used for general cyclic prefix (CP), and supports promptly, to define 4 DM-RS ports altogether up to 4 transport layers.In a word, every transport layer 12 Resource Units altogether provides the expense as DM-RS, in Fig. 1, is labeled as ' 1 ' or ' 2 '.Different subcarriers in two code division multiplexings (CDM) group acquisition frequency territory, that is, CDM+ frequency division multiplexing (FDM) is as basic multiplexing scheme.Each CDM group use in time-domain each length be 2 orthogonal code cover (orthogonal code cover, OCC) with multiplexing up to two transport layers.Under situation up to 2 transport layers, only there is CDM group 1, indicated like usefulness ' 1 '.

In LTE Rel-10, in single user's space is multiplexing, can in subframe, transmit up to the UE of two transmission blocks by every down link component carrier to scheduling.Each transmission block is assigned has its oneself modulation and encoding scheme.In addition, transmission block is associated with code word (CW), and carries out the transport layer mapping according to mapped mode.The channel-encoded bit that comes from the identical information bit block is commonly referred to as " code word ".Transmit in antenna assemblies or the system, the gained code word is modulated subsequently and be distributed in and transmit on the antenna so that transmit more.Precoding is to combine multi-antenna transmitting to send the mainstream technology of use.The basic principle that relates in the precoding is to mix to be incorporated in the modulation symbol that distributes on the antenna, also maybe current channel condition be taken into account simultaneously.Precoding for example can be multiply by the matrix that is selected with match channels and realized through the information that will carry the symbolic vector that comprises modulation symbol.Therefore the sequence of symbolic vector forms the collection of parallel symbol stream, and each this type of symbols streams is commonly referred to as " transport layer ".Therefore, decide according to the selection of precoder in special realization, transport layer can be directly corresponding to certain antenna, and perhaps transport layer can be distributed on the several antennas that are also referred to as antenna port through the precoder mapping.The mechanism of in this type systematic, codeword assignment being used to special transport layer is called " mapping ", or more particularly, is called " code word to transport layer mapping ".

Yet, the data that receiver node may not demodulation transmits through a plurality of transport layers.

Summary of the invention

The purpose of embodiment provides and a kind ofly enables the different mechanism that transmit the transport layers of orders to the demodulated reference signal mapping with effective means among this paper, thereby makes the data that receiver node can the demodulation transmission.

According to the first aspect of embodiment among this paper, a kind of method in the conveyer node is provided.This method is used on a plurality of transmission antennas, using more than two transport layers at Resource Block demodulated reference signal mode to be sent to receiver node.Conveyer node and receiver node are included in the radio circuit.

The conveyer node is mapped to more than two transport layers with a plurality of code words.The conveyer node is also according to based on the fixed mode that transmits order each transport layers of more than two transport layers being mapped to corresponding demodulated reference signal port.Each demodulation parameter signal port adds the demodulation parameter signal mode to Resource Block, and said demodulated reference signal port is associated with two code division multiplexing groups according to association mode.The transport layer of each code division multiplexing group carries out code division multiplexing, and the transport layer of different code division multiplexing group carries out frequency division multiplexing.

Each code word and demodulated reference signal mode that the conveyer precoding is carried through corresponding transport layer, and in Resource Block, the demodulated reference signal mode of precoding is sent to receiver node.

For carrying out this method, the conveyer node is provided in radio circuit, on a plurality of transmission antennas, using more than two transport layers in Resource Block, demodulated reference signal mode to be sent to receiver node in this article.

The conveyer node comprises the mapping circuit that is configured to a plurality of code words are mapped to more than two transport layers.In addition, the conveyer node comprises the additional mappings circuit that is configured to according to each transport layer of more than two transport layers being mapped to corresponding demodulated reference signal port based on the fixed mode that transmits order.Each demodulated reference signal port adds demodulated reference signal mode to Resource Block, and said demodulated reference signal port is associated with two code division multiplexing groups according to association mode.The transport layer of each code division multiplexing group carries out code division multiplexing, and the transport layer of different code division multiplexing group carries out frequency division multiplexing.The conveyer node also comprises and is arranged to each code word that precoding carries through corresponding transport layer and the pre-coding circuit of demodulated reference signal mode.

The conveyer node also comprises transfer circuit, and transfer circuit comprises a plurality of transmission antennas and is configured in Resource Block the demodulated reference signal mode of precoding is sent to receiver node.

Solution of the present invention at transport layer to providing public between demodulated reference signal (DM-RS) port or fixing mapped mode, thereby enable effective mapping.Thus, embodiment makes the data that receiver node can demodulation transmits.

In certain embodiments, use the mapping principle that is called mapping in the code word (CW) here, so that two code words are mapped to different code division multiplexings (CDM) group to realize that exceeding transmission order 2 transmits.When using the channel estimating of every transport layer, this mapping principle can be avoided disturbing between code word.

In certain embodiments, use to be called the mapping principle that shines upon between CW, with as far as possible with being assigned to two CDM groups with a relevant transport layer of code word.These embodiment of mapping have the advantage of following the DM-RS port numbering simply.

Some embodiment among this paper provide the mapping transport layer to the mode of demodulated reference signal, its for no matter use single user (SU) situation still be multi-user (MU) situation all be transparent.

Description of drawings

To embodiment be described in more detail about accompanying drawing now, wherein:

Fig. 1 is a schematic overview of describing Resource Block,

Fig. 2 is the schematic overview of conveyer node and receiver node,

Fig. 3 is the schematic overview that code word arrives the mapped mode of transport layer,

Fig. 4 is a schematic overview of describing Resource Block,

Fig. 5 is a block diagram of describing the embodiment of this solution,

Fig. 6 is the schematic overview according to the mapped mode of some embodiment of this solution,

Fig. 7 is the schematic overview according to the mapped mode of some embodiment of this solution,

Fig. 8 is the block diagram of mapping of the subscriber equipment of combined dispatching,

Fig. 9 is the schematic overview according to the mapped mode of some embodiment of this solution,

Figure 10 is the schematic overview according to the mapped mode of some embodiment of this solution,

Figure 11 is the block diagram of mapping of the subscriber equipment of combined dispatching,

Figure 12 is the schematic flow diagram of the method in the conveyer node, and

Figure 13 is the block diagram of conveyer node.

Embodiment

Fig. 2The basic communication system that has reference signal is shown, and wherein, system comprises Conveyer node 10With Receiver node 12Even example shown is to down link demodulated reference signal (DM-RS), conveyer node 10 also can be represented by radio base station or subscriber equipment, and receiver node 12 can be represented by subscriber equipment or radio base station.Conveyer node 10 can comprise Data block maker 14, wherein, the DM-RS pattern is inserted in data block or the Resource Block.The Resource Block that comprises DM-RS is sent to receiver node 12 through wireless channel subsequently.In addition, predefine DM-RS pattern between conveyer node 10 and receiver node 12, that is, receiver node 12 is known the DM-RS pattern in signal.Therefore, at receiver node 12, through Channel estimator 16The middle DM-RS target of using, promptly known DM-RS pattern is used channel estimating earlier.This channel estimating be used to subsequently carry out coherent detection so as Channel demodulator 18Middle demodulated received signal is with reliable and suitable mode restore data.With regard to down link, conveyer node 10 can transmit signal through a plurality of transmission antennas, and receiver node 12 can receive signal through a plurality of reception antennas.The channel matrix of expression channel status can be confirmed by the quantity that transmits antenna and reception antenna.Line number equals the quantity of reception antenna, and columns equals to transmit the quantity of antenna.The transmission order of matrix is to pass through the maximum quantity of different types of information of wireless channel transmission.Use every kind of information of different types of information of a plurality of transmission antennas transmission to may be defined as transport layer.

Conveyer node 10 is mapped to more than two transport layers with a plurality of code words, and according to based on the fixed mode that transmits order, and each transport layers of more than two transport layers is mapped to corresponding DM-RS port.Each code word and DM-RS pattern that 10 precodings of conveyer node are carried through corresponding transport layer, and in Resource Block, the DM-RS pattern of precoding is sent to receiver node.Receiver node 12 subsequently can be based on the data of DM-RS pattern demodulate reception.

Fig. 2 illustrates the schematic overview of radio circuit.This solution inserts (E-UTRA) system based on the evolved universal terrestrial radio and discusses, and this system is also referred to as the Long Term Evolution (LTE) of the WCDMA system of widespread deployment usually, but can in any radio circuit that uses OFDM and MIMO, realize.

Even example shown is to down link RS, conveyer node 10 also can be represented by radio base station or subscriber equipment, and receiver node 12 can be represented by subscriber equipment or radio base station.Embodiment among this paper relates generally to be used for the for example DM-RS design of senior the 10th version of LTE.This solution relates to the relation between transport layer and DM-RS port, and at transport layer to providing public between the DM-RS port or fixing mapped mode, thereby enable effectively mapping and make the data that receiver node can demodulation transmits thus.

As stated, the conveyer node is mapped to more than two transport layers with a plurality of code words. Fig. 3It is the schematic overview that code word arrives the transport layer mapping.For having transport layer Situation 31, supply single code word CW1 to precoding so that through a plurality of antennas transmission.For having two transport layers Situation 32, supply two code word CW1 and CW2 to precoding so that through a plurality of antennas transmission.For having three transport layers Situation 33, directly supply a code word CW1 to precoding.Also (S/P) converter supplies is to precoding through string for second code word CW2, and this string also (S/P) transducer is divided into two signals with it, and in situation 43, precoding encourages a plurality of antennas.For having four transport layers Situation 34, code word CW1 is fed to the corresponding S/P transducer that each codeword division is become two signals with CW2, and further is fed to precoding so that transmit through a plurality of antennas.For having five transport layers Situation 35, a code word CW1 is fed to a S/P transducer that it is divided into two signals, and further is fed to precoding.The second code word CW2 is fed to the 2nd S/P transducer that it is divided into three signals, and further is fed to precoding.Precoding is fed to a plurality of antennas.For having six transport layers Situation 36, the first code word CW1 is fed to a S/P transducer that it is divided into three signals, and further is fed to precoding.The second code word CW2 is fed to the 2nd S/P transducer that it is divided into three signals, and further is fed to precoding.Precoding is fed to a plurality of antennas.For having seven transport layers Situation 37, the first code word CW1 is fed to a S/P transducer that it is divided into three parts, and further is fed to precoding.The second code word CW2 is fed to the 2nd S/P transducer that it is divided into four parts, and further is fed to precoding.Precoding is fed to a plurality of antennas.For having eight transport layers Situation 38, two code word CW1 and CW2 are fed to corresponding S/P transducer, and each S/P transducer becomes four parts with signal segmentation, and further supply is used for precoding to encourage a plurality of antennas.

Transport layer transmits strong relevant with DM-RS port and data.Disclose the mapping between them among this paper, made receiver node how to know the data of demodulate reception.The DM-RS pattern that is used to transmit order 1-4 (being 1-4 transport layer) of two CMD groups of public use among Fig. 1.Yet, the embodiment among this paper also openly transmit order 5-8 DM-RS Design Pattern with further definition altogether 8 DM-RS ports enable higher MIMO rank.Be to keep based on the effective expansion that transmits order 1-4 pattern, provide as Among Fig. 4Shown in be used to transmit the following pattern of order 5-8.Be that 4 OCC length is used for each CDM group to form soft expansion in time-domain.Along the carrier wave of y axle definition frequency, and along x axle define symbol.This pattern is shared the identical RS position of the Resource Unit that is assigned to RS, and keeps two CDM groups not change, and this can make UE realize becoming light to a great extent.Through in time-domain, going up use OCC in four continuous resource unit (RE), the DM-RS pattern that is used for the 1st transport layer is carried out multiplexing with the DM-RS pattern that is used for the 2nd transport layer by means of CDM.Through in time-domain, on four continuous resource unit, using OCC, the DM-RS pattern that is used for the 3rd transport layer is carried out multiplexing with the DM-RS pattern that is used for the 4th transport layer by means of CDM.The DM-RS pattern that is used for the 1st transport layer and the 2nd transport layer is carried out multiplexing with the DM-RS pattern that is used for the 3rd transport layer and the 4th transport layer by means of frequency division multiplexing (FDM).

In addition, the DM-RS pattern shown in Fig. 4 will be used to transmit order 5-8 together with transmitting order 1-4.Therefore, provide among this paper from transmitting order 1 to the complete DM-RS pattern that transmits order 8.Disclose how transport layer is distributed to the DM-RS pattern that is used for single user situation and multi-user's situation among this paper, and the embodiment among this paper relates to how to distribute transport layer to the G1 of CDM group and the 2nd G2 of CDM group.

This solution is used code word.It should be noted, as above shown in Fig. 3, each code word (CW) be associated up to 4 transport layers, and transmit the order mapping for odd number, distribution such as the transport layer that does not wait will occur between two CW.Be used for data demodulates owing to introduce DM-RS, therefore, with the DM-RS port of the transport layer equal number that provides and transmit.Therefore, new mapping between transport layer and DM-RS port is provided in this solution.

Fig. 5Be to describe Rel-10 embodiment 510Block diagram, this embodiment illustrates this solution.Rel-10 embodiment 510 is carrying out Precoding process 513Before, remove Code word is to transport layer mapping 511Also carry out outward, Transport layer is to DM-RS mapping 512

As stated, under situation, will share a CDM group up to 2 CW up to 2 layers of transmission.Through transport layer shines upon to DM-RS in order in situation 32, to be causing the mapping of transmission order 2 definition, a shared CDM group very simply among transmission order 1 and Fig. 3 in situation 31 among use Fig. 3.Yet, under the situation that exceeds 2 layers of transmission (promptly＞transmit order 2), will use two CDM groups, and FDM is multiplexing each other, this makes a bit complicacy of mapping.This paper embodiment is provided at the relation between two CW and the DM-RS pattern.In addition, the embodiment of this solution is applicable to single user (SU) situation and multi-user (MU) situation, and is provided for the transparent mapped of SU and MU in this article.Therefore, this paper embodiment can cover SU situation and MU situation the two to save standard operation and also to reduce Operating Complexity.

This solution is disclosed in and is applicable under the situation that the many transport layers of down link transmit that the two transport layer of SU-MIMO and MU-MIMO is to public between the DM-RS or fixing mapped mode.More particularly, the mapping principle that is called mapping in the CW here is used to make two CW to be mapped to different CDM group in this paper embodiment to transmit order 2 and transmit to realize exceeding.Therefore, transmit order 1-2 mapping and can carry out, as among the Rel-9, re-use.When using every transport layer channel estimating, this mapping principle can be avoided disturbing between code word, and this is because code word is separated in two different CDM groups, and this can make h-arq (HARQ) handle to keep independent.The principle of shining upon in the CW is provided in Fig. 6-8.In addition, disclose among Fig. 9-11 and be called another fixing mapping of shining upon between CW.

Fig. 6First embodiment that illustrates according to this solution is used to shine upon the schematic overview of transport layer to the mapped mode of DM-RS port.Fig. 6 illustrates mapped mode in the code word.The DM-RS mode flag that is used for different CDM group does 62

For transmitting 3: the one CW of order, CW1 is mapped to transport layer 1.

Transport layer 1 is mapped to CDM group 1 G1The second code word CW2 is mapped to transport layer 2 and 3. Transport layer 2 and 3 is mapped to CDM group 2 G2

Be mapped to transport layer 1-2 for transmitting order 4:CW1.Transport layer 1-2 is mapped to G1.CW2 is mapped to transport layer 3 and 4. Transport layer 3 and 4 is mapped to G2.

Be mapped to transport layer 1-2 for transmitting order 5:CW1.Transport layer 1-2 is mapped to G1.CW2 is mapped to transport layer 3-5.Transport layer 3-5 is mapped to G2.

Be mapped to transport layer 1-3 for transmitting order 6:CW1.Transport layer 1-3 is mapped to G1.CW2 is mapped to transport layer 4-6.Transport layer 3-6 is mapped to G2.

Be mapped to transport layer 1-3 for transmitting order 7:CW1.Transport layer 1-3 is mapped to G1.CW2 is mapped to transport layer 4-7.Transport layer 3-7 is mapped to G2.

Be mapped to transport layer 1-4 for transmitting order 8:CW1.Transport layer 1-4 is mapped to G1.CW2 is mapped to transport layer 5-8.Transport layer 5-8 is mapped to G2.

Fixed mode according to the mapping of some embodiment of this solution can have the following advantages:

-be used to transmit the fixedly mapping principle of order 3-8 situation,

-cover the two fixedly mapped mode of SU-MIMO and MU-MIMO,

-keep independently HARQ as far as possible for each UE, and/or

-be applicable to common CP with the expansion CP the two, it has the different mode of Resource Unit

Then will be the description of SU-MIMO situation among this paper, be the description of MU-MIMO situation then.As stated, a CDM group is associated in so-called association mode with up to 4 DM-RS ports.For the purpose of illustration, we are following with the DM-RS port definition:

● the 1:DM-RS of CDM group port one/2/5/6

● the 2:DM-RS of CDM group port 3/4/7/8,

Alternatively

● the 1:DM-RS of CDM group port one/2/5/7

● the 2:DM-RS of CDM group port 3/4/6/8

For the SU-MIMO situation, a UE will take the Resource Block (RB) of distribution alone.Therefore, transmitting under the known situation of order, this UE can be data and transmits the transport layer that uses all supports.Mapping principle in the CW of the code word that is based on appointment among Fig. 3 in transport layer mapping and Fig. 6, Fig. 7Shown in detailed transport layer to the DM-RS port mapping.Fig. 7 illustrates according to the content of appointment and when only using a CDM group in Rel-9, can re-use the mapped mode that transmits order 1-2.Basic principle according to the embodiment of this solution is to be assigned to a DM-RS port in the CDM group with a relevant transport layer of code word.Be noted that each CDM group comprises that up to 4 DM-RS ports these DM-RS ports take 12 identical OFDM Resource Units, and carry out multiplexing through the orthogonal code covering.

Fig. 7 illustrates two enter code word CW1 and CW2.Produce the baseband signal of expression downlink physical channel through following steps.Each enter code word that will on physical channel, transmit passes through corresponding scrambling circuit with its bit scramble.Corresponding modulators modulation scrambling bit generates the complex value modulation symbol.The channel-encoded bit that comes from the identical information bit block is commonly referred to as " code word ".Code word is to broadcast (turbo) coding, rate-matched through for example carrying out the spy, interweave and wait the result of process information bit.Transmit in the antenna systems, the gained code word is modulated subsequently and be distributed in and transmit on the antenna so that transmit more.

Code word CW1 or CW2 can be fed to string (S/P) transducer also that CW1 and CW2 are divided into two signals respectively respectively, and the step of going forward side by side is carried out precoding so that transmit through a plurality of antennas.The complex value modulation symbol that is used for corresponding CW is mapped to transport layer.The complex value modulation symbol of single pre-coding circuit precoding on each transport layer is so that transmit on antenna port.The pre-coding circuit input is from the vector block of transport layer mapper, and generation will be mapped to the vector block on the resource on each antenna port.The complex value modulation symbol that corresponding channel resource mapper will be used for each antenna port is mapped to Resource Unit.Corresponding ofdm signal generative circuit generates complex value time-domain OFDM (OFDM) signal that is used for each antenna port.

Provide the code word that is used for transport layer 4-8 to shine upon or be called for short the expansion of transport layer mapping to transport layer.Expansion need with LTE the 8th version backward compatibility, and particularly introducing the minimum influence that current LTE standard is brought aspect the control signaling.

Fig. 7 illustrates the fixedly mapping up to the transmission order that transmits order 8 according to the embodiment of this solution.Each transmits order and has fixedly mapping scheme 711-718:

For the situation that has a transport layer 71, single code word CW1 is mapped to The first transport layer L1First transport layer is mapped to subsequently The one G1 of CDM group The one DM-RS port P1First transport layer also can be mapped to a G1's of CDM group The 2nd DM-RS port P2Modulation symbol and DM-RS are fed to precoding so that transmit through one or more transmission antennas.Modulation symbol also can be described as physical down link sharing channel (PDSCH) symbol here.

For the situation that has two transport layers 72, code word CW1 be mapped to the first transport layer L1 with The second transport layer L2The first transport layer L1 is mapped to a DM-RS port P1 subsequently, and the second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group.Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

For the situation that has three transport layers 73, a code word CW1 is mapped to the first transport layer L1.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently.The second code word CW2 be mapped to the second transport layer L2 with The 3rd transport layer L3The second transport layer L2 is mapped to subsequently The 3rd DM-RS port P3, and the 3rd transport layer L3 is mapped to The 2nd G2 of CDM group The 4th DM-RS port P4Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

For the situation that has four transport layers 74, a code word CW1 is mapped to the first transport layer L1 and the second transport layer L2.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and second transport layer is mapped to the 2nd DM-RS port P2 of a G1 of CDM group.The second code word CW2 be mapped to the 3rd transport layer L3 with The 4th transport layer L4The 3rd transport layer L3 is mapped to the 3rd DM-RS port P3 subsequently, and the 4th transport layer L4 is mapped to the 4th DM-RS port P4 of the 2nd G2 of CDM group.Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

For the situation that has five transport layers 75, a code word CW1 is mapped to the first transport layer L1 and the second transport layer L2.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and second transport layer is mapped to the 2nd DM-RS port P2 of a G1 of CDM group.The second code word CW2 be mapped to the 3rd transport layer L3, the 4th transport layer L4 and The 5th transport layer L5The 3rd transport layer L3 is mapped to the 3rd DM-RS port P3 subsequently, and the 4th transport layer L4 is mapped to the 4th DM-RS port P4, and the 5th transport layer L5 is mapped to the 2nd G2's of CDM group The 7th DM-RS port P7Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

For the situation that has six transport layers 76, a code word CW1 is mapped to the first transport layer L1, the second transport layer L2 and the 3rd transport layer L3.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and the second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group, and the 3rd transport layer L3 is mapped to a G1's of CDM group The 5th DM-RS port P5The second code word CW2 be mapped to the 4th transport layer L4, the 5th transport layer L5 and The 6th transport layer L6The 4th transport layer L4 is mapped to the 3rd DM-RS port P3 subsequently, and the 5th transport layer L5 is mapped to the 4th DM-RS port P4, and the 6th transport layer L6 is mapped to the 7th port P7 of the 2nd G2 of CDM group.Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

For the situation that has seven transport layers 77, a code word CW1 is mapped to the first transport layer L1, the second transport layer L2 and the 3rd transport layer L3.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and the second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group, and the 3rd transport layer L3 is mapped to the five-port P5 of a G1 of CDM group.The second code word CW2 be mapped to the 4th transport layer L4, the 5th transport layer L5, the 6th transport layer L6 and The 7th transport layer L7The 4th transport layer L4 is mapped to the 3rd DM-RS port P3 subsequently, and the 5th transport layer L5 is mapped to the 4th DM-RS port P4, and the 6th transport layer L6 is mapped to the 7th port P7, and the 7th transport layer is mapped to the 2nd G2's of CDM group The 8th DM-RS port P8Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

For the situation that has eight transport layers 78, code word CW1 be mapped to the first transport layer L1, the second transport layer L2, the 3rd transport layer L3 and The 8th transport layer L8The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently; The second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group; The 3rd transport layer L3 is mapped to the five-port P5 of a G1 of CDM group, and the 8th transport layer L8 is mapped to a G1's of CDM group The 6th DM-RS port P6The second code word CW2 is mapped to the 4th transport layer L4, the 5th transport layer L5, the 6th transport layer L6 and the 7th transport layer L7.The 4th transport layer L4 is mapped to the 3rd DM-RS port P3 subsequently, and the 5th transport layer L5 is mapped to the 4th DM-RS port P4, and the 6th transport layer L6 is mapped to the 7th port P7, and the 7th transport layer is mapped to the 8th port P8 of the 2nd G2 of CDM group.Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

Fig. 8Be depicted as the MU-MIMO situation and use the embodiment of this solution of mapping scheme in the code word, wherein, through the UE of 3 combined dispatchings UE1-UE3Use and transmit order 6 mapped modes.A transport layer L1 of the DM-RS port of UE1 through being mapped to 1 G1 of CDM group transmits data #1.2 transport layer L1, the L2 of the DM-RS port of DM-RS port and CDM group 2 G2s of UE2 through being mapped to 1 G1 of CDM group transmit data #1, #2.3 transport layer L1, L2, the L3 of two DM-RS ports of DM-RS port and CDM group 2 G2s of UE3 through being mapped to 1 G1 of CDM group transmit data #1, #2, #3.Cause having reduced the code word interference through keeping code word in different CDM group, to separate.

Fig. 9Some embodiment that illustrate according to this solution are used to shine upon the schematic overview of transport layer to the mapped mode of DM-RS port.Fig. 9 illustrates and illustrates mapped mode between the code word that embodiment is relative among the Fig. 6-8 that shines upon in the code word.The DM-RS mode flag that is used for different CDM group does 92Mapping is intended to make each CW to be mapped to as far as possible in two CDM groups between code word.Following DM-RS port numbering is to carry out shining upon between transport layer.The method has gem-pure mapping between transport layer and DM-RS port.

For transmitting order 3: transport layer 1 and 2 is mapped to the DM-RS port of CW1 and CW2 and 1 G1 of CDM group.Transport layer 3 is mapped to the DM-RS port of the second code word CW2 and 2 G2 of CDM group.

For transmitting order 4: transport layer 1-2 is mapped to the DM-RS port of CW1 and CW2 and 1 G1 of CDM group. Transport layer 3 and 4 is mapped to the DM-RS port of CW1 and CW2 and 2 G2 of CDM group.

For transmitting order 5: transport layer 1-3 is mapped to the DM-RS port of CW1 and CW2 and 1 G1 of CDM group.Transport layer 4-5 is mapped to the DM-RS port of code word CW1 and CW2 and 2 G2 of CDM group.

For transmitting order 6: transport layer 1-3 is mapped to the DM-RS port of CW1 and CW2 and 1 G1 of CDM group.Transport layer 4-6 is mapped to the DM-RS port of CW1 and CW2 and 2 G2 of CDM group.

For transmitting order 7: transport layer 1-4 is mapped to the DM-RS port of CW1 and CW2 and 1 G1 of CDM group.Transport layer 5-7 is mapped to the DM-RS port of CW1 and CW2 and 2 G2 of CDM group.

For transmitting order 8: transport layer 1-4 is mapped to the DM-RS port of CW1 and CW2 and 1 G1 of CDM group.Transport layer 5-8 is mapped to the DM-RS port of CW1 and CW2 and 2 G2 of CDM group.

Figure 10Illustrate based on the fixedly mapping of the code word of appointment among Fig. 3 to the principle of shining upon between transport layer mapping and CW.Transport layer detailed shown in Figure 10 is to the DM-RS port mapping; Wherein, As also in the above in the CW described in the mapping; The transport layer mapping that is used for transmitting order 1-2 SU/MU-MIMO can re-use the content in Rel-9 appointment, and only uses a CDM group, and the transport layer mapping that is used to transmit order 3-8 SU-MIMO is to assign as far as possible and a transport layer to two that code word is a relevant CDM group.Advantage is simply to follow the DM-RS port numbering.In addition, as stated, the DM-RS port of CDM group is the DM-RS port of alternative distribution among this paper, that is, and and the 1-DM-RS of CDM group port one/2/5/7 and the 2-DM-RS of CDM group port 3/4/6/8.

Figure 10 illustrates the fixedly mapping up to the transmission order that transmits order 8.Each transmits order and has fixedly mapping scheme 1011-1018:

For the situation that has a transport layer 101, single code word CW1 is mapped to The first transport layer L1First transport layer is mapped to subsequently The one G1 of CDM group The one DM-RS port P1First transport layer also can be mapped to a G1's of CDM group The 2nd DM-RS port P2Modulation symbol and DM-RS are fed to precoding so that transmit through one or more transmission antennas.

For the situation that has two transport layers 102, a code word CW1 is mapped to the first transport layer L1, and a CW2 is mapped to The second transport layer L2The first transport layer L1 is mapped to a DM-RS port P1 subsequently, and the second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group.Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.

For the situation that has three transport layers 103, a code word CW1 is mapped to the first transport layer L1.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently.Modulation symbol and DM-RS are fed to precoding so that transmit through a plurality of antennas.The second code word CW2 be mapped to the second transport layer L2 with The 3rd transport layer L3The second transport layer L2 is mapped to the 2nd DM-RS port P2 subsequently, and the 3rd transport layer L3 is mapped to The 2nd G2 of CDM group The 3rd DM-RS port P3Modulation symbol and DM-RS pattern are fed to precoding so that transmit through a plurality of antennas.

For the situation that has four transport layers 104, a code word CW1 is mapped to the first transport layer L1 and the second transport layer L2.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and second transport layer is mapped to the 2nd DM-RS port P2 of a G1 of CDM group.The second code word CW2 be mapped to the 3rd transport layer L3 with The 4th transport layer L4The 3rd transport layer L3 is mapped to the 3rd DM-RS port P3 subsequently, and the 4th transport layer L4 is mapped to the 2nd G2's of CDM group The 4th DM-RS port P4Modulation symbol and DM-RS pattern are fed to precoding so that transmit through a plurality of antennas.

For the situation that has five transport layers 105, a code word CW1 is mapped to the first transport layer L1 and the second transport layer L2.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and second transport layer is mapped to the 2nd DM-RS port P2 of a G1 of CDM group.The second code word CW2 be mapped to the 3rd transport layer L3, the 4th transport layer L4 and The 5th transport layer L5The 3rd transport layer L3 is mapped to the 3rd DM-RS port P3 subsequently, and the 4th transport layer L4 is mapped to the 4th DM-RS port P4 of the 2nd G2 of CDM group.The 5th transport layer L5 is mapped to a G1's of CDM group The 5th DM-RS port P7Modulation symbol and DM-RS pattern are fed to precoding so that transmit through a plurality of antennas.

For the situation that has six transport layers 106, a code word CW1 is mapped to the first transport layer L1, the second transport layer L2 and the 3rd transport layer L3.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and the second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group, and the 3rd transport layer L3 is mapped to the 3rd DM-RS port of the 2nd G2 of CDM group.The second code word CW2 be mapped to the 4th transport layer L4, the 5th transport layer L5 and The 6th transport layer L6The 4th transport layer L4 is mapped to the 4th DM-RS port P4 of the 2nd G2 of CDM group subsequently, and the 5th transport layer L5 is mapped to the 5th DM-RS port P5 of a G1 of DM-RS group.The 6th transport layer L6 is mapped to the 2nd G2's of CDM group The 6th port P6Modulation symbol and DM-RS pattern are fed to precoding so that transmit through a plurality of antennas.

For the situation that has seven transport layers 107, a code word CW1 is mapped to the first transport layer L1, the second transport layer L2 and the 3rd transport layer L3.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and the second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group, and the 3rd transport layer L3 is mapped to the 3rd port P3 of the 2nd G2 of CDM group.The second code word CW2 be mapped to the 4th transport layer L4, the 5th transport layer L5, the 6th transport layer L6 and The 7th transport layer L7The 4th transport layer L4 is mapped to the 4th DM-RS port P4 of the 2nd G2 of CDM group subsequently, and the 5th transport layer L5 is mapped to the 5th DM-RS port P5 of a G1 of CDM group, and the 6th transport layer L6 is mapped to the 6th port P6 of the 2nd G2 of CDM group.The 7th transport layer L7 is mapped to a G1's of CDM group The 7th port P7Modulation symbol and DM-RS pattern are fed to precoding so that transmit through a plurality of antennas.

For the situation that has eight transport layers 108, a code word CW1 is mapped to the first transport layer L1, the second transport layer L2, the 3rd transport layer L3 and the 4th transport layer.The first transport layer L1 is mapped to the DM-RS port P1 of a G1 of CDM group subsequently, and the second transport layer L2 is mapped to the 2nd DM-RS port P2 of a G1 of CDM group.The 3rd transport layer L3 is mapped to the 3rd port P3 of the 2nd G2 of CDM group, and the 4th transport layer L4 is mapped to the 4th port P4 of the 2nd G2 of CDM group.The second code word CW2 be mapped to the 5th transport layer L5, the 6th transport layer L6, the 7th transport layer L7 and The 8th transport layer L8The 5th transport layer L5 is mapped to the 5th DM-RS port P5 of a G1 of CDM group subsequently, and the 6th transport layer L6 is mapped to the 6th DM-RS port P6 of the 2nd G2 of CDM group, and the 7th transport layer L7 is mapped to the 7th port P7 of a G1 of CDM group.The 7th transport layer is mapped to the 2nd G2's of CDM group The 8th port P8Modulation symbol and DM-RS pattern are fed to precoding so that transmit through a plurality of antennas.

Figure 11Illustrate and describe mapping scheme, wherein, use transmission order 6 mapping schemes through each UE that is respectively 3 combined dispatchings of 1 transport layer, 2 transport layers and 3 transport layers for the acting example of MU-MIMO what state.Therefore, dispatching first user equipment (UE) 1 is that transport layer 1 L1 that is mapped to the DM-RS port of a G1 of CDM group transmits data #1.Dispatching second user equipment (UE) 2 is that 2 transport layer L1, the L2 that is mapped to the DM-RS port of a G1 of CDM group transmits data #1, #2.Dispatch the 3rd user equipment (UE) 3 and transmit data #1, #2, #3 for three transport layer L1, L2, the L3 of the DM-RS port of the DM-RS port that is mapped to a G1 of CDM group and the 2nd G2 of CDM group.The DM-RS pattern is followed the transmission order 3 that is used for shining upon between code word.

It should be understood that in addition for the MU-MIMO situation, can carry out the control signaling with to which DM-RS port assignment of each UE indication to which transport layer.This can guarantee that UE uses suitable DM-RS to carry out channel estimating.

For the MU-MIMO situation, several UE will share identical Resource Block simultaneously.Therefore, transmitting under the known situation of order pattern, each UE will only use the part of the transport layer of transmission.Strong simple, the natural expansion of hoping to proceed to the SU-MIMO situation.Embodiment proposes to be used for following two step process of MU-MIMO situation

-step 1: distribute each UE according to mapping between mapping principle in the CW or CW

-step 2: be the UE repeating step 1 of other combined dispatching.

This paper embodiment can re-use the SU-MIMO mapping scheme on multi-subscriber dispatching, it can make the transport layer of in Fig. 7 or 10, proposing transparent for SU-MIMO and MU-MIMO to DM-RS port mapping scheme.This also satisfies the principle of between SU-MIMO and MU-MIMO, dynamically switching.This solution openly is used to transmit order 1-2 SU/MU-MIMO and transmits the two fixedly transport layer mapping of order 3-8 SU-MIMO, wherein, need not any additional control signaling.

Now with reference Among Figure 12The flow chart of being described, description is called in the conveyer node of conveyer 10 in the drawings, is used for demodulated reference signal being sent at Resource Block according to some general embodiment the method step of receiver node 12.Step needn't be carried out with following order, but can carry out with any suitable order.Conveyer node 10 uses more than two transport layers on a plurality of transmission antennas.Conveyer node 10 is included in the radio circuit with receiver node 12.Therefore, Figure 12 illustrates the conveyer node 10 that mapping is sent to receiver node 12 according to the mapping of this solution and through signal.

Step 120.Indicated like dotted line, this is an optional step.In certain embodiments, conveyer node 10 can be controlled to the signal of indication which or which the demodulated reference signal port assignment of receiver node 12 to receiver node 12.

Step 121.Conveyer node 10 is mapped to more than two transport layers with a plurality of code words.For example, according to can be based on transmitting the fixing algorithm of order, first code word be mapped to different transport layers with second code word.

Step 123.Conveyer node 10 is according to based on the fixed mode that transmits order each transport layers of more than two transport layers being mapped to corresponding demodulated reference signal port.

Each demodulated reference signal port adds demodulated reference signal mode to Resource Block.The demodulated reference signal port is associated with two code division multiplexing groups according to association mode.The transport layer of each code division multiplexing group carries out code division multiplexing, and the transport layer of different code division multiplexing group carries out frequency division multiplexing.Therefore, transport layer in Resource Block, carry out CDM and FDM multiplexing.

Each code division multiplexing group of two code division multiplexing groups of association mode definable comprises that up to four demodulated reference signal ports each demodulated reference signal port adds demodulated reference signal to Resource Block according to demodulated reference signal mode.The demodulated reference signal mode of each code division multiplexing group of two code division multiplexing groups takies identical OFDM Resource Unit, and the transport layer of each code division multiplexing group of two code division multiplexing groups carries out multiplexing through orthogonal code covering (OCC).Therefore, OCC separates the information that transmits through different transport layers.

In certain embodiments, the transport layer that the fixed mode definable is mapped to certain code word is mapped to the demodulated reference signal port in the same code division multiplexing group, mapping in the so-called code word.Alternatively, the transport layer that the fixed mode definable is mapped to certain code word is mapped to the demodulated reference signal port in the different code division multiplexing group, shines upon between so-called code word.

Fixed mode is applicable to transmitting order 2-8.

Step 125.Each code word and demodulated reference signal mode that 10 precodings of conveyer node are carried through corresponding transport layer.For example, the conveyer node comes precoding to carry the Resource Block of code word and DM-RS pattern with the following methods: make the different DM-RS patterns and the code word that are used for different transport layers to transmit through one or more transmission antennas.

Precoder is a weighting matrix.Data symbol and DM-RS will share precoder, and therefore, suitable channel information can be through being able to estimation based on DM-RS pattern recognition transport layer.

The basic principle that relates in the precoding is to mix to be incorporated in the modulation symbol that distributes on the antenna, also maybe current channel condition be taken into account simultaneously.Precoding for example can be multiply by the matrix that is selected with match channels and realized through the information that will carry the symbolic vector that comprises modulation symbol.Therefore the sequence of symbolic vector forms the collection of parallel symbol stream, and each this type of symbols streams is commonly referred to as " transport layer ".Therefore, decide according to the selection of precoder in special realization, transport layer can be directly corresponding to certain antenna, and perhaps transport layer can be distributed on the several antennas that are also referred to as antenna port through the precoder mapping.

Step 127.Conveyer node 10 is sent to receiver node 12 with the demodulated reference signal mode of precoding in Resource Block.After precoding, output is the data and the DM-RS pattern of precoding.The DM-RS pattern is relatively independent of precoding.

It should be noted that Resource Block can be assigned to a plurality of receiver nodes and/or be assigned to a receiver node with single user's multiple-input and multiple-output mode with multi-user's multiple-input and multiple-output mode.

Demodulated reference signal mode can be used for the physical down link sharing channel demodulation.

In certain embodiments, the first code division multiplexing group associations of two code division multiplexing groups is to demodulated reference signal port numbers 1,2,5 and 6 or 1,2,5 and 7.The second code division multiplexing group of two code division multiplexing groups is related with demodulated reference signal port 3,4,7 and 8 or 3,4,6 and 8.This can define in fixable association mode.

For carrying out said method, conveyer node 10 is provided.Conveyer node 10 can be represented by radio base station or subscriber equipment.For example look the radio access technologies that uses and term and decide, radio base station can be described as NodeB for example, enode b (eNB or eNode B), base transceiver station (base transceiver station), access point base station, base station router or can with any other NE of communications of user equipment in the respective cell.

Subscriber equipment can be represented by the device of for example wireless communication terminal, mobile cellular telephone, PDA(Personal Digital Assistant), wireless platform, laptop computer, computer or any other kind that can wirelessly communicate by letter with radio base station.

Figure 13Illustrate by radio base station and represent and comprise for example mapping/treatment circuit such as processor; Carry out the conveyer node 10 of mapping to the mapped mode between the DM-RS port according to transport layer in LTE Rel-10; Wherein, the DM-RS port will be used for data demodulates basically to support a plurality of LTE advanced features.Conveyer node 10 transmits through transfer circuit and is mapped to receiver node.Therefore, the modulation symbol of first code word and second code word is mapped to three or more a plurality of transport layer that will be sent to receiver node 12.Conveyer node 10 also based on the transmission order of channel, is mapped to two demodulated reference signal ports in the code division multiplexing group with more than two transport layers.The demodulated reference signal port is associated with this two code division multiplexing groups according to association mode.Thus, on each transport layer, use the transmission of code word to be assigned unique reference signal.The transport layer that is produced by the mapping to the demodulated reference signal port of each code division multiplexing group carries out code division multiplexing and frequency division multiplexing each other.Code word and DM-RS pattern that conveyer node 10 precoding is subsequently carried through transport layer, and transmit the data of precodings through a plurality of transmission antennas.Conveyer node 10 is arranged to be included in the radio circuit with receiver node 12.

Conveyer node 10 comprises and is configured to a plurality of code words are mapped to more than two transport layers Mapping circuit 1301

Conveyer node 10 also comprises and being configured to according to based on the fixed mode that transmits order each transport layers of more than two transport layers being mapped to corresponding demodulated reference signal port Additional mappings circuit 1302Each demodulated reference signal port arrangements becomes to add demodulated reference signal mode to Resource Block.The demodulated reference signal port is associated with two code division multiplexing groups according to association mode.The transport layer of each code division multiplexing group carries out code division multiplexing, and the transport layer of different code division multiplexing group carries out frequency division multiplexing.

In addition, conveyer node 10 comprises and is arranged to each code word that precoding carries through corresponding transport layer and demodulated reference signal mode Pre-coding circuit 1303Conveyer node 10 also comprises Transfer circuit 1304, transfer circuit 1304 comprises a plurality of transmission antennas and is configured in Resource Block the demodulated reference signal mode of precoding is sent to receiver node 12.

In addition, transfer circuit 1304 signal that can be arranged to control to receiver node 12 with to receiver node 12 indication which or which demodulated reference signal port assignment to each receiver node.

Be used for Resource Block demodulated reference signal mode is sent to receiver node this mechanism can through as in the conveyer node 10 depicted in figure 13 Treatment circuit 1305Realize together with the computer program code of the function that is used to carry out this solution etc. one or more processors.Above mentioned program code also can be provided as computer program, for example, is used to carry out the form of data medium of the computer program code of solution of the present invention when being written in the conveyer node 10 to be carried at.An examples of such carriers can be with CD ROM CD form.Yet, through being feasible such as other data mediums such as memory sticks.In addition, computer program code can be provided as the pure program code on server, and downloads to conveyer node 10.

Therefore; Figure 13 illustrates and comprises for example mapping/treatment circuit such as processor; Carry out the conveyer node 10 that shines upon according to transport layer in LTE Rel-10 to the mapped mode between the DM-RS port, wherein, the DM-RS port will be used for data demodulates basically to support a plurality of LTE advanced features.Conveyer transmits through transfer circuit and is mapped to receiver.

Disclosed herein is the solution of not having L1 control signaling at transport layer to fixing or public mapped mode is provided between the DM-RS port.Disclose the DM-RS port and be used for data demodulates basically to support to use the for example embodiment of a plurality of LTE advanced features of MIMO such as CoMP and spatial reuse function.More particularly; Here through shining upon between mapping or CW in the CW; Used the mapped mode of following mapping principle, in the CW between mapping and CW mapping mean respectively exceeding to transmit and two CW be mapped in the different CDM group or with balance mode each CW is mapped in two CDM groups.Transmitting order 1-2 SU/MU-MIMO mapping can re-use as among the Rel-9.

Use the embodiment of mapped mode to have the following advantages among this paper:

Be used to transmit the fixedly mapping principle of order 3-8 situation,

Cover the two fixedly mapped mode of SU-MIMO and MU-MIMO,

Applicable common CP and the two the pattern of expansion CP of being used for, and/or

The applicable transport layer mapping that is used to retransfer.

In addition, among some embodiment that in using CW, shine upon,, therefore, keep independent HARQ for each UE as far as possible owing to reduced the code word interference through keeping code word in different CDM group, to separate.In using some embodiment that shine upon between CW, realized the mapping scheme of simplifying.

In drawing and description, example embodiment of the present invention is disclosed.Yet, substantially do not break away under the situation of principle of the present invention, can carry out many variations and modification to these embodiment.Correspondingly, though adopted specific term, just using them with general and descriptive meaning, is not in order to limit, and scope of the present invention is defined by the claims of enclosing.

Claims (11)

1. one kind is used on a plurality of transmission antennas, using more than two transport layers demodulated reference signal mode to be sent to the method for receiver node (12) at Resource Block in conveyer node (10); Said conveyer node (10) and receiver node (12) are included in the radio circuit, and said method comprises:

-with a plurality of code words Mapping(121) to said more than two transport layers,

-according to fixed mode, with each transport layer of said more than two transport layers based on the transmission order Mapping(123) to corresponding demodulated reference signal port; Wherein each said demodulated reference signal port adds demodulated reference signal mode to said Resource Block; Said demodulated reference signal port is associated with two code division multiplexing groups according to association mode; Wherein the transport layer of each code division multiplexing group carries out code division multiplexing, and the transport layer of different code division multiplexing group carries out frequency division multiplexing

- Precoding(125) each code word and the demodulated reference signal mode that carry through corresponding transport layer, and

-in said Resource Block with the demodulated reference signal mode of precoding Transmit(127) to said receiver node (12).

2. method according to claim 1; Each code division multiplexing group that wherein said association mode defines said two code division multiplexing groups comprises up to four demodulated reference signal ports; Each demodulated reference signal port adds demodulated reference signal to said Resource Block according to said demodulated reference signal mode; And the demodulated reference signal mode of each code division multiplexing group of said two code division multiplexing groups takies identical OFDM Resource Unit, and the transport layer of each code division multiplexing group of said two code division multiplexing groups through orthogonal code cover carry out multiplexing.

3. according to each described method of claim 1-2, the transport layer that wherein said fixed mode definition is mapped to certain code word is mapped to the demodulated reference signal port in the same code division multiplexing group, shines upon in the so-called code word.

4. according to each described method of claim 1-2, the transport layer that wherein said fixed mode definition is mapped to certain code word is mapped to the demodulated reference signal port in the different code division multiplexing group, shines upon between so-called code word.

5. according to each described method of claim 1-4, wherein said Resource Block is assigned to a plurality of receiver nodes with multi-user's multiple-input and multiple-output mode.

6. method according to claim 5 comprises that also which demodulated reference signal port assignment is control signaling (120) to indicate to each receiver node to said receiver node (12).

7. according to each described method of claim 1-6, wherein said Resource Block is assigned to receiver node with single user's multiple-input and multiple-output mode.

8. according to each described method of claim 1-7, wherein said fixed mode is applicable to and transmits order 2-8.

9. according to each described method of claim 1-8, wherein said demodulated reference signal mode is used for the physical down link sharing channel demodulation.

10. according to each described method of claim 1-9, the first code division multiplexing group associations of wherein said two code division multiplexing groups is to demodulated reference signal port numbers 1,2,5 and 6 or 1,2,5 and 7; And second code division multiplexing group be associated with demodulated reference signal port 3,4,7 and 8 or 3,4,6 and 8.

11. one kind is used on a plurality of transmission antennas, using more than two transport layers in Resource Block, demodulated reference signal mode to be sent to the conveyer node (10) of receiver node (12) at radio circuit, comprises:

Mapping circuit (1301) is configured to a plurality of code words are mapped to said more than two transport layers,

Additional mappings circuit (1302); Be configured to according to fixed mode based on the transmission order; Each transport layer of said more than two transport layers is mapped to corresponding demodulated reference signal port; Wherein each said demodulated reference signal port arrangements becomes to add demodulated reference signal mode to said Resource Block, and said demodulated reference signal port is associated with two code division multiplexing groups according to association mode, and each transport layer of wherein said two code division multiplexing groups carries out code division multiplexing; And the transport layer of different code division multiplexing group carries out frequency division multiplexing

Pre-coding circuit (1303) is configured to each code word and demodulated reference signal mode that precoding is carried through corresponding transport layer, and

Transfer circuit (1304) comprises said a plurality of transmission antenna and is configured in said Resource Block the demodulated reference signal mode of precoding is sent to said receiver node (12).

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